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The AAPG/Datapages Combined Publications Database
GCAGS Transactions
Abstract
A Case Study of Using Aqueous Formate Solution for Carbon Sequestration and Geological Storage
Abstract
Carbon dioxide (CO2) has been used as a carbon carrier for geological carbon storage. However, various shortcomings come from its physical properties, such as low carbon density at low to moderate pressure, low mass density, low viscosity, immiscibility with water, and corrosivity.
This paper presents the first case study of using aqueous formate solution as carbon-bearing water for carbon storage and enhanced oil recovery. Properties of formate solutions in brine were measured, such as solubilities, densities, and viscosities. Then, numerical reservoir simulations were performed for carbon storage and enhanced oil recovery by aqueous formate solution and by CO2. The two cases exhibited different flow regimes, and the formate injection case resulted in a greater amount of oil recovery and carbon storage, primarily because of more stable fronts of oil and water displacement.
An economic analysis based on numerical reservoir simulations gave the equivalent cost of CO2 reduction into formate for the same net present value as the CO2 injection case, and the breakeven cost of the reaction process for the formate injection case. This is the first time formate, the simplest carboxylate, was studied as a carbon carrier to reduce the carbon emission of oil production.
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